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Some Zoas pack a punch. I'd avoid putting them near sensitive SPS like Millis. My tank's a 90-gallon with Orphek bars, 7.8 pH, and carbon dosing. Maybe run carbon if you're worried about chemical warfare?

Let us know what you find. Stray voltage is a sneaky one, easy to overlook. If it's not that, maybe try reducing light intensity for a bit. Sometimes corals just need a break from high light, especially if they're already stressed.

Bleaching can happen for a few reasons. How's your alkalinity and calcium? Acropora are super sensitive to swings. Also, what's your temp stability like? Even small fluctuations can stress them out. I'd check those first before messing with anything else.